fix clang warnings

[peppergrayxyz]

building using clang causes some warnings:

check linker flags
neoverse-n1 (-DADLINK) warns about unsupported linker flags:

clang: warning: optimization flag '-fuse-linker-plugin' is not supported [-Wignored-optimization-argument]
clang: warning: argument unused during compilation: '-fuse-ld=gold' [-Wunused-command-line-argument]

add check for ld.gold and only use it if available

use portable inttypes
warning about format specifier mismatch:

src/os/sysinfo.c:173:26: warning: format specifies type 'unsigned long long' but the argument has type 'uint64_t' (aka 'unsigned long') [-Wformat]
  173 |     sprintf(str, "%llu", info->frequency);
      |                   ~~~~   ^~~~~~~~~~~~~~~
      |                   %lu
src/os/sysinfo.c:193:129: warning: format specifies type 'int' but the argument has type 'uint64_t' (aka 'unsigned long') [-Wformat]
  193 |             snprintf(branding, sizeof(branding), BOX64_BUILD_INFO_STRING_SHORT " on %.*s @%04d MHz", 28, box64_sysinfo.cpuname, box64_sysinfo.frequency / 1000000);
      |                                                                                           ~~~~                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                                                           %04lu

use inttypes format macros instead of format specifiers directly

print missing argument
warning about an unused parameter:

src/emu/x64int3.c:208:117: warning: data argument not used by format string [-Wformat-extra-args]
  208 |                     snprintf(buff, 256, "%04d|%p: Calling %s(\"%s\")", tid, *(void**)(R_RSP), s, (tmp)?tmp:"(nil)", (tmp2)?tmp2:"nil");
      |                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                                               ^

use array indexing
warning about the way the signature is formated:

src/wrapped/wrappedvulkan_private.h:80:1: warning: adding 'int' to a string does not append to the string [-Wstring-plus-int]
src/libtools/vulkanoverlay.c:133:94: note: expanded from macro 'GO_vFpff'
  133 | #define GO_vFpff(A, B, N)      static void my_##A##_##N(void* a, float b, float c) {F3(A, #B +2, N);}
      |                                                                                     ~~~~~~~~~^~~~~~
src/wrapped/wrappedvulkan_private.h:80:1: note: use array indexing to silence this warning

follow compiler suggestion and replace #B +2 with &(#B)[2]

use proper type in function signature
warning about type mismatch:

src/wrapped/wrappedgmp.c:158:38: warning: passing 'const char *' to parameter of type 'void *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
  158 |     return my->__gmp_vasprintf(strp, fmt, VARARGS);
      |                                      ^~~
  165 |     return my->__gmp_vfprintf(stream, fmt, VARARGS);
      |                                       ^~~
  176 |     return my->__gmp_vasprintf(strp, fmt, VARARGS);
      |                                      ^~~
  187 |     return my->__gmp_vfprintf(stream, fmt, VARARGS);
      |                                       ^~~

modifiy definition to use the actual type instead of void.

remove extraneous parentheses
warning about extraneous parentheses:

src/wrapped32/wrappeddbus.c:541:18: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
  541 |         if((type == (int)'s')) {
      |             ~~~~~^~~~~~~~~~~
src/wrapped32/wrappeddbus.c:541:18: note: remove extraneous parentheses around the comparison to silence this warning

[ksco]

Thank you for merging this!

[ptitSeb]

Remove the needs of a C++ compiler.

[peppergrayxyz]

I changed CXX to C and I added these as well:

excess elements in initializer
building using clang warns about excess elements in initializer

src/wrapped/wrappercallback.h:16:53: warning: excess elements in struct initializer [-Wexcess-initializers]
   16 | static TYPENAME(LIBNAME) TYPENAME2(my_, LIBNAME) = {0};
      |                                                     ^

remove excessive argument
building using clans warns about too many arguments:

src/wrapped32/wrappedopenal.c:104:41: warning: too many arguments in call to 'fillALProcWrapper32'
  104 |         fillALProcWrapper32(emu->context);
      |         ~~~~~~~~~~~~~~~~~~~             ^
src/wrapped32/wrappedopenal.c:104:28: warning: passing arguments to 'fillALProcWrapper32' without a prototype is deprecated in all versions of C and is not supported in C23 [-Wdeprecated-non-prototype]
  104 |         fillALProcWrapper32(emu->context);
      |                            ^

Remove the argument, because the function doesn't take any